WO2017217648A1

WO2017217648A1 - Wireless power transmission antenna, and device and system using same

Info

Publication number: WO2017217648A1
Application number: PCT/KR2017/003856
Authority: WO
Inventors: 이동혁
Original assignee: 엘지이노텍(주)
Priority date: 2016-06-13
Filing date: 2017-04-10
Publication date: 2017-12-21
Also published as: KR20170140666A

Abstract

The present invention relates to: a wireless power transmission antenna capable of maximizing wireless power transmission efficiency and minimizing heating; and a wireless power transmission device and a wireless charging system, which comprise the same. The wireless power transmission device according to one embodiment of the present invention can include: the wireless power transmission antenna, which has a multi-layer structure in which a charging bed, a control circuit board, and a plane-shaped spiral transmission coil, for transmitting wireless power, disposed at the lower end of the charging bed, are stacked, wherein the number of windings is different on at least one of the layers; and a shielding material disposed at a lower end of the wireless power transmission antenna so as to block a magnetic field, having been transmitted by the wireless power transmission antenna, from being transferred to the control circuit board.

Description

Wireless power transmitting antenna and apparatus and system using same

The present invention relates to a wireless power transmission technology, and in detail, wireless power transmission antenna for maximizing wireless power transmission efficiency and minimizing heat generation during wireless power transmission to a wireless power receiving device equipped with a metal component in the center of the rear of the main body. The present invention relates to a wireless power transmitter and a wireless charging system using the device.

Recently, with the rapid development of information and communication technology, a ubiquitous society based on information and communication technology is being made.

In order for telecommunications devices to be connected anytime and anywhere, sensors incorporating computer chips with communication functions must be installed in all social facilities. Therefore, the problem of power supply of these devices and sensors is a new problem. In addition, as the number of mobile devices such as Bluetooth handsets and music players such as iPods has increased rapidly, charging a battery has required users time and effort. In recent years, wireless power transmission technology has been attracting attention as a way to solve this problem.

Wireless power transmission or wireless energy transfer is a technology that transmits electrical energy wirelessly from a transmitter to a receiver using the principle of induction of magnetic field, which is already used by electric motors or transformers using the electromagnetic induction principle in the 1800s. Since then, there have been attempts to transmit electrical energy by radiating electromagnetic waves such as radio waves and lasers. Electric toothbrushes and some wireless razors that we commonly use are actually charged with the principle of electromagnetic induction.

To date, energy transmission using wireless may be classified into magnetic induction, electromagnetic resonance, and power transmission using short wavelength radio frequency.

The magnetic induction method uses the phenomenon that magnetic flux generated at this time causes electromotive force to other coils when two coils are adjacent to each other and current flows to one coil, and is rapidly commercialized in small devices such as mobile phones. Is going on. Magnetic induction is capable of transmitting power of up to several hundred kilowatts (kW) and has high efficiency, but the maximum transmission distance is less than 1 centimeter (cm).

The magnetic resonance method is characterized by using an electric or magnetic field instead of using electromagnetic waves or current. Since the magnetic resonance method is hardly affected by the electromagnetic wave problem, it has the advantage of being safe for other electronic devices or the human body. On the other hand, it can be utilized only in limited distances and spaces, and has a disadvantage in that energy transmission efficiency is rather low.

Short-wavelength wireless power transfer schemes, simply RF schemes, utilize the fact that energy can be transmitted and received directly in the form of RadioWave. This technology is a wireless power transmission method of the RF method using a rectenna, a compound word of an antenna and a rectifier (rectifier) refers to a device that converts RF power directly into direct current power. In other words, the RF method is a technology that converts AC radio waves to DC and uses them. Recently, research on commercialization has been actively conducted as efficiency is improved.

Wireless power transfer technology can be used in various industries, such as the mobile, IT, railroad and consumer electronics industries.

However, in the case of a wireless power receiving device such as a smart watch, a metal part is located at the center of the rear of the main body, and a shielding material cannot be mounted at the center of the rear of the main body for mounting and integrating various sensors. Accordingly, the electromagnetic field transmitted by the wireless power transmitter is directly absorbed by the metal component, thereby lowering the wireless power transmission efficiency and generating heat around the metal component.

The present invention has been devised to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a wireless power transmission antenna capable of maximizing wireless power transmission efficiency and minimizing heat generation, and a wireless power transmission apparatus and a wireless charging system having the same. To provide.

Another object of the present invention is to provide a wireless power transmission apparatus having an asymmetric wireless power transmission antenna having a multilayer structure such that a propagation direction of a wireless power signal is beamformed to a receiving coil.

Another object of the present invention is to provide a wireless power transmission / reception antenna optimized for a small integrated device such as a smart watch and a wireless charging system using the same.

Technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

The present invention provides a wireless power transmission antenna capable of maximizing wireless power transmission efficiency and minimizing heat generation, a wireless power transmission apparatus and a wireless charging system provided therewith.

Wireless power transmission antenna according to an embodiment of the present invention has a multi-layer structure by stacking a spiral transmission coil of a planar shape for transmitting wireless power, the number of windings of the stacked spiral transmission coil is configured differently in at least one layer Can be.

Here, the spiral transmission coil may be in the form of any one of a circle, an ellipse, and a polygon.

In addition, the stacked spiral transmission coils may be connected in series with each other.

In addition, the number of turns of the spiral transmission coil for each floor may be increased in a direction in which the wireless power is transmitted.

The spiral transmission coil may include an outer diameter and an inner diameter, and the closer the outer diameter is to the outer diameter, the greater the stacking thickness of the spiral transmission coil.

In addition, the spiral transmission coil may include an outer diameter and an inner diameter, but the closer the inner diameter is, the more the stack thickness of the spiral transmission coil may increase.

Wireless power transmission apparatus according to another embodiment of the present invention is disposed on the charging bed, the control circuit board and the lower side of the charging bed, has a multilayer structure by stacking a spiral transmission coil of a planar shape for transmitting wireless power, The number of turns of the stacked spiral transmission coils is differently arranged in at least one layer, and the wireless power transmission antenna and the lower side of the wireless power transmission antenna are disposed so that an electromagnetic field transmitted by the wireless power transmission antenna is applied to the control circuit board. It may be configured to include a shield to block the transmission.

The wireless power transmission apparatus may further include a shielding wall configured along an inner diameter of the stacked spiral transmission coil.

Wireless charging system according to another embodiment of the present invention has a multi-layer structure by stacking a spiral transmission coil of a planar shape for transmitting wireless power, the number of windings of the stacked spiral transmission coil is different in at least one layer A wireless power transmission apparatus including a configured wireless power transmission antenna, and a wireless power reception antenna for receiving an AC signal induced by an electromagnetic field radiated by the wireless power transmission antenna, and a rectifier for converting the received AC signal into a DC signal. It may include a wireless power receiver.

Here, the wireless power receiving antenna includes a spiral receiving coil of a planar shape, the shielding material is disposed on the upper end of the spiral receiving coil, the shielding material may be disposed only between the inner diameter and the outer diameter of the spiral receiving coil.

In addition, a metal component is disposed inside the inner diameter of the spiral receiving coil, and the electromagnetic field between the wireless power transmitting antenna and the wireless power receiving antenna such that the radiated electromagnetic field is directed toward the spiral receiving coil without being transmitted to the metal component. A beam can be formed.

In addition, the wireless power receiving antenna may have a multilayer structure by stacking a spiral receiving coil of a planar shape.

In addition, the number of turns of the stacked spiral receiving coils may be configured differently in at least one layer.

For example, the spiral receiving coil may include an outer diameter and an inner diameter, but the closer the outer diameter is, the more the stack thickness of the spiral receiving coil is increased.

As another example, the spiral receiving coil may include an outer diameter and an inner diameter, but the closer the inner diameter is, the more the stack thickness of the spiral receiving coil is increased.

The wireless power receiver of the wireless charging system may further include a shielding wall configured along an inner diameter of the stacked spiral receiving coil.

The above aspects of the present invention are only some of the preferred embodiments of the present invention, and various embodiments in which the technical features of the present invention are reflected will be described in detail below by those skilled in the art. Can be derived and understood.

The effects on the method and apparatus according to the present invention are described as follows.

The present invention has the advantage of providing a wireless power transmission antenna and a wireless power transmission apparatus mounted thereon that can maximize wireless power transmission efficiency and minimize heat generation.

In addition, the present invention has the advantage of providing a wireless power transmission apparatus and a wireless charging system using the same that can be beamformed to the receiving coil the propagation direction of the wireless power signal through a multi-layered asymmetric transmission coil.

In addition, the present invention is to provide a wireless power transmission device that is optimized for a wireless power receiver that is not equipped with a shielding material is disposed in the center portion of the rear rear of the main body, and the wireless power signal is not transmitted to the location. There is this.

In addition, the present invention has an advantage that can provide a wireless power transmission and reception antenna optimized for a small integrated device such as a smart watch and a wireless charging system using the same.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings are provided to facilitate understanding of the present invention, and provide embodiments of the present invention together with the detailed description. However, the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute new embodiments.

1 is a view for explaining the structure of a wireless charging system according to an embodiment of the present invention.

2 to 6 are views for explaining the structure of a wireless power transmission apparatus according to an embodiment of the present invention.

7 is a view for explaining the configuration of a wireless charging system according to an embodiment of the present invention.

8 is a view for explaining the structure of a wireless power receiving antenna according to an embodiment of the present invention.

9 is a view for explaining the structure of a wireless power receiving antenna according to another embodiment of the present invention.

Wireless power transmission apparatus according to an embodiment of the present invention is disposed on the charge bed, the control circuit board and the bottom of the charge bed, a spiral transmission coil of a planar shape for transmitting wireless power is laminated to have a multi-layer structure, The number of turns of the stacked spiral transmission coils is differently arranged in at least one layer, and the lower end of the wireless power transmission antenna and the electromagnetic field transmitted by the wireless power transmission antenna are transmitted to the control circuit board. It may include a shield to block the thing.

Hereinafter, an apparatus and various methods to which embodiments of the present invention are applied will be described in more detail with reference to the accompanying drawings. The suffixes "module" and "unit" for components used in the following description are given or used in consideration of ease of specification, and do not have distinct meanings or roles from each other.

In the description of the embodiments, where it is described as being formed on the "top" or "bottom" of each component, the top (bottom) or the bottom (bottom) is the two components are in direct contact with each other or One or more other components are all included disposed between the two components. In addition, when expressed as "up (up) or down (down)" may include the meaning of the down direction as well as the up direction based on one component.

In the description of the embodiment, a wireless power transmitter, a transmitter, a transmitter, a transmitter, a transmitter, a power transmitter, and the like are used for the convenience of description of the wireless power transmitter that constitutes the wireless power transfer system. In addition, a wireless power receiver, a receiver, a receiver, a receiver, a receiver, a receiver, a receiver, and a power receiver may be used interchangeably as a representation of the wireless power receiver.

In the description of the embodiment, a transmission coil, a primary coil, a primary coil, etc. are mixed for the convenience of description as a representation of a power transmission antenna mounted on a wireless power transmission apparatus and transmitting power in a non-contact manner. Can be used.

In the description of the embodiment, a receiver coil, a secondary coil, a secondary coil, etc. are mixed for the convenience of description as a representation of a power receiving antenna mounted on the wireless power receiver and receiving power in a non-contact manner. Can be used.

The transmitter according to the present invention may be configured in the form of a pad or a cradle, and one transmitter may include a plurality of wireless power transmission means to wirelessly transmit power to a plurality of receivers.

The receiver according to the present invention includes a mobile phone, a smart phone, a smart watch, a laptop computer, an electronic dictionary, an electronic book, a digital broadcasting terminal, a personal digital assistant (PDA), It can be used in small electronic devices such as PMP (Portable Multimedia Player), navigation, MP3 player, other electric toothbrushes, wireless earphones, hearing aids, smart rings, and the like, but is not limited thereto. Any device that can be charged is enough.

1 is a block diagram illustrating a wireless charging system according to an embodiment of the present invention.

Referring to FIG. 1, a wireless charging system includes a wireless power transmitter 10 that largely transmits power wirelessly, a wireless power receiver 20 that receives the transmitted power, and an electronic device 30 that receives the received power. Can be configured.

For example, the wireless power transmitter 10 and the wireless power receiver 20 may perform in-band communication for exchanging information using the same frequency band as the operating frequency used for wireless power transmission. In another example, the wireless power transmitter 10 and the wireless power receiver 20 perform out-of-band communication for exchanging information using a separate frequency band different from an operating frequency used for wireless power transmission. It can also be done.

For example, the information exchanged between the wireless power transmitter 10 and the wireless power receiver 20 may include control information as well as status information of each other. Here, the status information and control information exchanged between the transmitting and receiving end will be more clear through the description of the embodiments to be described later.

The in-band communication and the out-of-band communication may provide bidirectional communication, but are not limited thereto. In another embodiment, the in-band communication and the out-of-band communication may provide one-way communication or half-duplex communication.

For example, the unidirectional communication may be performed by the wireless power receiver 20 only transmitting information to the wireless power transmitter 10, but is not limited thereto. The wireless power transmitter 10 may transmit information to the wireless power receiver 20. It may be to transmit.

In the half-duplex communication method, bidirectional communication between the wireless power receiver 20 and the wireless power transmitter 10 is possible, but at one time, only one device may transmit information.

The wireless power receiver 20 according to an embodiment of the present invention may obtain various state information of the electronic device 30. For example, the state information of the electronic device 30 may include current power usage information, information for identifying a running application, CPU usage information, battery charge status information, battery output voltage / current information, and the like. The information may be obtained from the electronic device 30 and may be utilized for wireless power control.

In particular, the wireless power transmitter 10 according to an embodiment of the present invention may transmit a predetermined packet indicating whether to support fast charging to the wireless power receiver 20. The wireless power receiver 20 may notify the electronic device 30 when it is determined that the connected wireless power transmitter 10 supports the fast charging mode. The electronic device 30 may indicate that fast charging is possible through predetermined display means provided, for example, it may be a liquid crystal display.

In addition, the user of the electronic device 30 may control the wireless power transmitter 10 to operate in the fast charge mode by selecting a predetermined fast charge request button displayed on the liquid crystal display. In this case, when the quick charge request button is selected by the user, the electronic device 30 may transmit a predetermined quick charge request signal to the wireless power receiver 20. The wireless power receiver 20 may convert the normal low power charging mode into the fast charging mode by generating a charging mode packet corresponding to the received fast charging request signal to the wireless power transmitter 10.

Referring to FIG. 2, the apparatus 200 for transmitting power wirelessly may include a charging bed 210, a wireless power transmitting antenna 220, a shielding material 230, and a control circuit board 240.

Although not explicitly shown in FIG. 2, it should be noted that the wireless power transmission antenna 220 and the control circuit board 240 may be electrically connected to each other through a predetermined binding terminal or line.

The charging bed 210 is for positioning the device to be charged, but the shape of the charging bed 210 may be flat, but this is only one embodiment and may be implemented in a hemispherical shape, a concave shape, a cup shape, or the like.

The lower side of the charging bed 210 may be equipped with a wireless power transmission antenna 220 having a multi-layer spiral transmission coil.

The shielding material 230 may block the electromagnetic signal emitted from the wireless power transmission antenna 220 from being transmitted to the control circuit board 240.

For example, the shielding material 230 may be a ferrite shielding material, but this is only one embodiment, and another shielding material capable of blocking electromagnetic waves may be used. In addition, the shielding material 230 may have a form of a sand dust block, an adhesive sheet, or a metal plate, but is not limited thereto.

The control circuit board 240 may be equipped with a microprocessor for controlling the overall operation of the wireless power transmitter 200 as well as various power conversion elements.

Hereinafter, a cross-sectional structure of a wireless power transmission apparatus according to an embodiment of the present invention will be described in detail with reference to FIG. 3.

As shown in FIG. 3, the wireless power transmission antenna 220 according to an embodiment of the present invention has a multilayer structure in which a spiral transmission coil having a planar shape for transmitting wireless power is stacked, and the stacked spiral transmission coil is stacked. The number of turns of can be configured differently in at least one layer.

Here, the spiral transmission coil may be any one of a circle, an ellipse, and a polygon, but is not limited thereto, and may vary according to the shape and internal configuration of the wireless power transmission device 200. .

In one embodiment, the stacked helical transmission coils may be connected in series with each other, but is not limited thereto, and it should be noted that the stacked helical transmission coils according to another embodiment may be connected in parallel.

For example, when the stacked spiral transmission coils are also connected in series with each other, a spiral transmission coil having a multilayer structure may be configured by using one coated conductive wire.

As shown in FIG. 3, the wireless power transmission antenna 220 according to an embodiment increases the number of turns of the spiral transmission coil for each floor as the wireless power is transmitted, that is, closer to the charging bed 210. Can be configured.

Referring to FIG. 3A of FIG. 3, the spiral transmission coil of the wireless power transmission antenna 220 may be composed of three layers. At this time, the number of turns of each layer may be reduced to 6-> 4-> 2 as the distance from the charging bed 210. Here, the number of turns per layer is only one embodiment, it should be noted that depending on the configuration aspect of the wireless power transmission apparatus 200, the number of stacked layers and the number of turns per layer may be configured differently.

It is not explicitly shown in Figures 2 to 3 above. It should be noted that the wireless power transmission antenna 220 and the control circuit board 240 may be electrically connected to each other through a connection terminal or a conductive wire. At this time, the arrangement structure and configuration method of the connection terminal may be different according to the design purpose of those skilled in the art.

According to another embodiment of the present invention, the wireless power transmitting antenna 220 is a direction in which wireless power is transmitted, that is, closer to the charging bed 210 as shown in FIG. 4A of FIG. 4. The number of turns may be configured to be reduced.

Referring to FIG. 4, the spiral transmission coil 220 according to an embodiment includes an outer diameter 410 and an inner diameter 420, but the closer the outer diameter 410 is, the greater the stack thickness of the spiral transmission coil 220. Can be.

Referring to FIG. 5, as the spiral transmission coil 220 according to another exemplary embodiment of the present invention is closer to the inner diameter 420 as shown in FIG. 5A, the stack thickness of the coil may increase.

Referring to FIG. 6, as shown in FIG. 6A, a shielding wall 610 may be configured along an inner diameter 420.

Radiation of the electromagnetic field output by the spiral transmission coil 220 through the shielding wall 610 in the inward direction of the spiral transmission coil 220 may be blocked.

Referring to FIG. 7, the wireless charging system 700 has a multilayer structure in which spiral transmission coils having a planar shape for transmitting wireless power are stacked, and the winding number of the stacked spiral transmission coils is different in at least one layer. The wireless power transmitter including the power transmission antenna 220 and the electromagnetic field radiated by the wireless power transmission antenna 220 is induced to receive an AC signal and the wireless power receiving antenna 710 and the received AC signal as a DC signal. It may be configured to include a wireless power receiver including a receiving circuit board 730 including a rectifier to convert.

The wireless power receiver antenna 710 may include a spiral receiving coil having a planar shape, and a shielding material 720 may be disposed on an upper end of the spiral receiving coil. In this case, the shielding member 720 may be disposed only between the inner diameter and the outer diameter of the spiral receiving coil. As a result, the shielding material used in the wireless power receiver can be minimized, and as shown in FIG. 7A, since the shielding material is not present at the central portion of the receiving circuit board 730, the design freedom of the receiving circuit board 730 is increased. It can increase. In addition, not only the reception circuit configuration but also the component placement and design freedom of the device to which the wireless power receiver is mounted, including, for example, a smart watch, can be increased.

In addition, metal parts 740 may be disposed inside the inner diameter of the spiral receiving coil 710 as shown by reference numeral 7a. In this case, the wireless power transmitting antenna 220 and the spiral receiving coil 710-that is, the electromagnetic field radiated by the wireless power transmitting antenna 220 is directed to the spiral receiving coil 710 without being transmitted to the metal parts 740. The electromagnetic beam 750 may be formed between the wireless power receiving antennas.

In addition, various sensors may be mounted on one central side of the main body rear cover 760 of the wireless power receiver 700. For example, the sensor may include a biometric sensor such as a body temperature sensor and a heart rate sensor. According to the present invention, since the electromagnetic beam 750 is formed so that the electromagnetic field radiated by the wireless power transmitting antenna 220 is directed to the spiral receiving coil 710 without being transmitted to the metal component 740 and the sensors, the component due to heat generation. This has the advantage of minimizing damage.

The wireless power receiver antenna 710 may have a multilayer structure by stacking a spiral receiver coil having a planar shape.

In FIG. 7, the number of windings of the stacked spiral receiving coils 710 is shown to be the same per layer. However, this is only an example, and as illustrated in FIGS. 8 to 9, which will be described later, per layer of the spiral receiving coil. The number of turns may be configured differently in at least one layer.

For example, the spiral receiving coil 710 having a multi-layer structure may be configured by stacking one wire in a spiral manner, but this is only one embodiment, and another embodiment of the present invention uses one wire. A spiral receiving coil 710 having a multilayer structure may be formed by configuring a spiral receiving coil having a planar shape and connecting a plurality of spiral receiving coils in parallel to each other.

Through the wireless charging system configuration of FIG. 7, the present invention can expect the following advantages and effects.

First, the present invention has the advantage of providing a wireless power transmission antenna and a wireless power transmission apparatus mounted thereon capable of maximizing wireless power transmission efficiency and minimizing heat generation.

Secondly, the present invention has the advantage of providing a wireless power transmission apparatus capable of beamforming a radio wave propagation direction of a wireless power signal to a receiving coil through an asymmetric transmission coil having a multilayer structure, and a wireless charging system using the same.

Third, the present invention can provide a wireless power transmission device that is optimized for a wireless power receiver that is not equipped with a shielding material that is disposed in the center portion of the rear rear of the main body, and the wireless power signal is not transmitted to the location. There is this.

Fourth, the present invention has an advantage of providing a wireless power transmission and reception antenna optimized for a small integrated device such as a smart watch and a wireless charging system using the same.

Referring to FIG. 8, the spiral receiving coil 810 of the wireless power receiving antenna 800 may include an outer diameter 801 and an inner diameter 802.

As shown in FIG. 8, when the number of windings for each layer of the spiral receiving coil 810 having a multi-layer structure is different, the closer the outer diameter 801 is to the laminated thickness of the spiral receiving coil 810 may be increased.

A shielding material 820 may be disposed on one side of the upper end of the spiral receiving coil 810 having a multilayer structure. In this case, the shielding material 820 may be disposed only between the inner diameter 802 and the outer diameter 801 of the spiral receiving coil 810. Through this, not only the amount of shielding material used in the wireless power receiver can be minimized, but also as shown in FIG. 7A of FIG. 7, the shielding material is not disposed in the center portion of the receiving circuit board 730. There is an advantage that can increase the design freedom of the circuit board 730. In addition, not only the reception circuit configuration but also the component placement and design freedom of the device to which the wireless power receiver is mounted, including, for example, a smart watch, can be increased.

Referring to FIG. 9, the spiral receiving coil 910 may include an outer diameter 901 and an inner diameter 902, and the closer the inner diameter 902 is to the laminated thickness of the spiral transmitting coil 910. Can be.

In addition, the wireless power receiving antenna 900 may further include a shielding wall 920 configured along the inner diameter 902 as well as a shielding material 930 disposed on one side of the upper end of the stacked spiral receiving coil 910. have.

It is apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the present invention.

Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless charging technology, and can be applied to a wireless power transmitting antenna and devices equipped with the same, a wireless charging system including the devices.

Claims

A charging bed;

Control circuit board;

A wireless power transmission antenna disposed at a lower end of the charging bed and having a multi-layered structure in which spiral transmission coils having a planar shape for transmitting wireless power are stacked, and having a winding number of the stacked spiral transmission coils different in at least one layer. ; And

A shielding material disposed at a lower end of the wireless power transmitting antenna to block an electromagnetic field transmitted by the wireless power transmitting antenna from being transmitted to the control circuit board;

Wireless power transmission device comprising a.
The method of claim 1,

The spiral transmission coil is in the form of any one of a circle, an ellipse, a polygon, and the spiral transmission coil having a multi-layer structure is connected to each other in series.
The method of claim 1,

The number of turns of the spiral transmission coil for each floor is increased in the direction in which the wireless power is transmitted, and the spiral transmission coil includes an outer diameter and an inner diameter,

The closer the outer diameter is, the laminated thickness of the spiral transmitting coil increases, the wireless power transmission apparatus.
The method of claim 1,

The number of turns of the spiral transmission coil for each floor is increased in the direction in which the wireless power is transmitted, and the spiral transmission coil includes an outer diameter and an inner diameter,

The closer to the inner diameter, the laminated thickness of the spiral transmission coil increases, the wireless power transmission device.
The method according to claim 3 or 4,

And a shielding wall configured along the inner diameter of the stacked helical transmission coil.
A wireless power transmission device including a wireless power transmission antenna having a multilayered structure in which a spiral transmission coil having a planar shape for transmitting wireless power is stacked and having a winding number of the stacked spiral transmission coils differently in at least one layer; And

The wireless power receiver includes a wireless power receiver antenna for inducing electromagnetic fields radiated by the wireless power transmitter antenna to receive an AC signal, and a rectifier for converting the received AC signal into a DC signal.

Including, wireless charging system.
The method of claim 6,

The wireless power receiver antenna includes a spiral receiving coil in a planar shape, and a shielding material is disposed on an upper end of the spiral receiving coil, and the shielding material is disposed only between an inner diameter and an outer diameter of the spiral receiving coil. system.
The method of claim 7, wherein

A metal component is disposed inside the inner diameter of the spiral receiving coil, and an electromagnetic beam is disposed between the wireless power transmitting antenna and the wireless power receiving antenna such that the radiated electromagnetic field is directed to the spiral receiving coil without being transmitted to the metal component. A wireless charging system, characterized in that it is formed.
The method of claim 6,

The wireless power receiving antenna has a multi-layered structure in which the spiral receiving coils of a planar shape are stacked, and the number of turns of the stacked spiral receiving coils is configured to be different in at least one layer.
The method of claim 9,

The spiral receiving coil includes an outer diameter and an inner diameter,

The closer to one of the outer diameter or the inner diameter, the laminated thickness of the spiral receiving coil increases, and the shielding wall is configured along the inner diameter of the stacked spiral receiving coil.